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Improved anodic stripping voltammetric measurements of silver by codeposition with mercury
Author(s) -
Wang Joseph,
Li Ruiliang,
Huiliang Huang
Publication year - 1989
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140010507
Subject(s) - mercury (programming language) , anodic stripping voltammetry , detection limit , chemistry , stripping (fiber) , analytical chemistry (journal) , reproducibility , mercure , cathodic stripping voltammetry , anode , environmental chemistry , inorganic chemistry , electrochemistry , materials science , electrode , cathodic protection , chromatography , composite material , computer science , programming language
Significant improvements in the stripping voltammetric response of silver are observed in the presence of low levels (20 μg/L) of mercury. The formation of amalgam results in a higher sensitivity, sharper peak, improved reproducibility, and extended linear range when compared to analogous measurements in the absence of mercury. Even though mercury has a slightly more negative stripping potential than silver, no interference is observed because of its low level. The silver response is evaluated with respect to mercury and silver concentrations, deposition time and potential, coexisting metals, organic surfactants, and other variables. The detection limit is 1.4 × 10 −10 M (16‐min deposition), and the relative standard deviation (at 5 × 10 −8 M) is 1.3%. Applicability to speciation work and river water samples is demonstrated. Additional work in this laboratory should lead to further improvements.